Construction of the hulls of ships and boats.



H. E. ROSS 7 CONSTRUCTION OF THE HULLS 0F SHIPS AND BOATS.

APPLICATION IILBD APR. 4, 1905.

PATENTED NOV. 14. 1905.-

.Buildin s, George street,

UNITED sTATEs PATENT OFFICE.

HERBER ERNEST ROSS, or ,sYD EY, NEW SOUTH W ES, AUSTRALIA. CONSTRUCTION OF THE IHIULYLS OF SHIPS AND BoATs.

Specification cf Letters Patent.

Patented Nov. 14, 1995.

To all whom it may concern: 7

Be, it known that I, HERBERT ERNEST Ross, a subset of the King of Great Britain and Irelan and a resident of Equitable 'dney, inthe State 0 New SouthVVales, ommonwealth of Australia, have invented a certain new and useful Improved Construction of the Hulls of Shipsand Boats, (for which I have applied for a atent in the. Commonwealth" 0 Australia, 0. 2,641, and bearing date March 2, 1905,) of which the following is a specification.

In givin effect to the invention the hull of a vesse isconstructed on novel lines, whereby (a) the wave displacement shall be reduced to a minimum; (6) the submerged surfaces shall be reduced when the vessel is moving with s eed; (c) the skin-friction on the bottom wil be reduced when the vessel.

,is moving, such reduction offi'iction being effected by'an automatic generation of-airbubbles adj acentto the skin when the vesse 4 is in motion.

The type of hull at present almost univer.

I sally in vogue cleaves the water at the bows,

the ener of the motive power, which forces the hull t rough, the water, being largelyexpended in displacing the mass of water in 39' ont of the ShlP.

The special object of the present inven tion is toprovide .such a construction of hull that the vessel shall have a'tendency to skim or glide, as nearly as possible, over the sur face of the water. To this end the lan of thehull will be an oblong or paralle ogram in contour, with vertical or approximately vertical sides depending from. the long edges of the parallelogram. The bottom'edges of the sides and the'external bottom will each form a convex curve, deepest at the center and tapering to'zero at both ends, or, briefly stated, each will be a segment of a circle of which the deck of the'ship will be parallelor thereabout to the chord. Between the segmental 'sides .the external bottom will bepeller-shaft may be inclosed and the sternclearancebe of solid dead-wood or the shaft may be'left bare. v

' In order that the invention may be prop' erly understood, reference is made tothe ac- I companying sheet of drawings, in which' Figure 1 is a diagrammatic side elevation of a hull constructedaccording to this invention. To more clearly demonstrate the lines upon which a hull should be built, transverse sections willbe taken on .the lines A, B, and

fined between the-sides D-and t e bottom E of the hull;

Ward this wedge of air'will disappear and its As the vesselis propelled for place be taken by a foaming or ebullient mass of'aerated water. This aereted water cannotescape laterally, but'must passbeneath the. hull throughout its whole length, finally emerging from its confinement at the stern of the vessel, thereby greatly reducing the surface friction on the convex-concave external bottom. Thevessel will, in point of fact,- be supported partly upon a cushion of air confined between the segmental sidesand the convex-concave external bottom.v

All other things bein equal, the faster the vessel is propelledt e greater willbe its emergence"from the water, until when a high speed is devehilped the hull will merely.

skim or glide over t e surface of'the water a manner somewhat analogousto a sledge ice or snow.

Having-now described my mvent1on,what

skimming or'gliding over a hard surface of I claim as new, and desire to secure by Letters Patent, is-

-The hull of a ship the deck of which is, ap-

proximately,v oblong or parallelogram in shape, sides proj ecting verticallydownward from "the long ,edges of the arallelogram, such sides being, ap roximate y, in the form of equal segments o a circle, and an external bottom which, longitudinally, is of the same Too convexity as the curved lower-edges of the] segmehtal sides, but, transversely, is concaved, as and for the-purposes specified.

. In witness whereof I have'hereunto set my hand in presence of two witnesses.

HERBERT ERNEST Ross,

Witnesses: v

ALBERT, MAssEY, MANEIEID NEWTON. 

